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Physics 1992 JAMB Past Questions

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31

Which of the following factors has no effect on the e.m.f. of a primary cell?

  • A. temperature
  • B. size of the cell
  • C. nature of the plate
  • D. nature of the electrolyte
View Answer & Discuss (4) JAMB 1992
32
A wire of length 15m made of a material of resistivity 1.8 x 10-6\(\Omega\)m has a resistance of 0.27\(\Omega\). Determine the area of the wire
  • A. 1.5 x 10-4m2
  • B. 1.0 x 10-4m2
  • C. 2.7 x 10-5m2
  • D. 7.3 x 10-6m2
View Answer & Discuss (3) JAMB 1992
33
A 5-v battery is connected across the plates of a 2.0\(\mu\)F uncharged parallel plate capacitor. The charge on the capacitor after a long time is
  • A. 2.5\(\mu\)C
  • B. 10.0\(\mu\)C
  • C. 20.0\(\mu\)C
  • D. 50.0\(\mu\)C
View Answer & Discuss JAMB 1992
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34
Which of the following apparatus will require the smallest fuse rating for its protection?
  • A. 60W, 240V
  • B. 60W, 40V
  • C. 40W, 12V
  • D. 40W, 5V
View Answer & Discuss (1) JAMB 1992
35
The heat produced in a conductor carrying an electric current is
  • A. inversely proportional to the current and the resistance
  • B. directly proportional to the current, resistance and the time
  • C. inversely proportional to of the resistance, current and the time
  • D. directly proportional to the square of the current, the resistance and the time
View Answer & Discuss (4) JAMB 1992
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